Senior Lecturer, University of the West of England (UWE Bristol).
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Saved a checkpoint:
Adjusting t critical values to DOFs = 9 (previously DOFs= 18 which was incorrect)
Before relaxing boundaries for part D
Gave some feedback: Ready to use
Fixed "sum" error.
Removing use of pooled variance, taking a more conservative approach that it is not known whether the population standard deviations are nearly equal (which is assumed when pooling variances).